Kaldrma is located in the municipality Gračac, in Zadar County at an elevation of 690 meters above sea level and it covers the area of 4.81 km² (1.86 sq. miles). According to the 2011 census report, there were 30 inhabitants. It is predominantly populated by Serbs (93%), but also Croats (7%). Nearby places: Dugopolje, Tiškovac Lički, Osredci, Kunovac Kupirovački, Kupirovo, Gornji Srb, Donji Srb, Neteka, Drenovac Osredački and Rastičevo.